Sick danois need advice

[Mgonza11]

Over the weekend one of my danios became lethargic with pieces of his tail and dorsal fins missing. and stopped feeding and I found it dead this morning with some white fuzzy stuff on its back. I think the fuzz might be white algae that has recently bloomed in the tank, at least I think it's algae. Today another Danio is looking a bit sluggish so I quarantined him just in case. The other danios, guppies and ghost shrimp are active and look healthy so any advice would really be appreciated before I lose any more fish.

 

[usasiamom]

Sounds like columnaris to me. Research it right away and see if it fits. It is extremely contagious and deadly, so check fast.

 

[Mgonza11]

I did some research and it looks like it might be columnaris so I will head to the pet store tomorrow and get methylene blue to treat the fish and tank. Any suggestions for or against this treatment?

 

[usasiamom]

Someone with experience may chime in here. Meanwhile, just follow exactly the treatments you see online. Good luck!